Automatic coin controlled telephone apparatus



July 28, 1931. 1,816,073 I I AUTOMATIC COIN CONTROLLED TELEPHONE APPARATUS c. A. UCAMBAY Original Filed Oct. 27. 1 927 7 Sheets-Sheet 1 July 28, 1931. c. A. CAMBAY 1,816,073

AUTOMATIC COIN CONTROLLED TELEPHONE APPARATUS Original Filed 00 27. 1927 7 Sheets-Sheet 2 July 28, 1931. c. A. CAMBAY 1,816,073

AUTOMATIC Com CONTROLLED TELEPHONE APPARATUS Original Filed Oct. 27. 1927 7 Sheets-Sheet 3 July 28, 1931. c. A..cAMBAY 1,316,073

AUTOMATIC COIN CONTROLLED TELEPHONE APPARATUS Origial P16; 001;. 27. 1927 7 Sheds-Sheet 4 July 28, 1931.

C. A. CAMBAY 7 Sheets-Sheet July 28, 1931. c':. A. cAMBAY AUTOMATIC COIN CONTROLLED TELEPHONE APPARATUS original Filed Oct. 27. 1927 7Sheets-Sheet 6 I. f I J g ill 28, C. A. CAMBAY I AUTOMATIC COIN CONTROLLED TELEPHONE APPARATUS Original Filed Oct. 27, 1927 7 Sheets-Sheet 7 Patented July 28, 1931 CHARLES moan CAMBAY, oFrAItIs, FRANCE AUTOMATIC CCIN CONTROLLED TELEPHONE APPARATUS Original application filed October 27, 1927, Serial No. 229,071, and in France October 6, 1927. Divided and this application filed January 3, 1929. Serial No. 330,002.

The invention relates to coin-controlled mechanism for telephones for use in local and suburban telephoning, and has for its object the use of-two different coins or tokens corresponding to different tariffs.

The mechanism is operated by the user of the telephone without intervention of the central exchange operator.

The mechanism prevents fraudulent use,

and is free from errors of operation, and includes in combination arrangements as follows:

(a) Means to control the introduction of the coins by closing the coin slot if the 1 receiver is not on the hook:

(6) Means operated to close the first slot after a coin has been inserted, and open a second slot:

(0) Mechanism for locking and unlocking 2a the receiver hook, the unlocking being effected by inserting a coin, and the locking by hanging up the receiver on its hook: I

(d) Tilting .mechanism to support the coins after insertion. I I (e) Electro-magnetic mechanism to tilt the coin mechanism to retain or return the coin, operated by talking current to retain the coin when the user unhooks the receiver.

(f) Mechanism to operate the tilting 3o mechanism to return the coin when the receiver is hung up.

(g) A registering mechanism to register or count the coins retained.

(it) An auxiliary. microphone to transmit the sound of a bell, sounded by one of the coins, to the central station.

(11) Mechanism to return all of the parts to normal position by the hanging upof the receiver.

(j) Mechanism to render the auxiliary microphone inoperative when communication has been established.

' (k) Mechanism to prevent fraudulent use after communication has been established.

(Z) Means to communicate with the central operator. when the wrong subscriber has been connected.

7 The combination of .these various mechanisms is effected by two movable plates, 50 an upper and a lower plate, having sliding connection between them, such that their ascending movements are independent but the descent of the upper plate returns the means to place the electro-magnet out of circuit.

In the drawings, in similarly designated Fig. l is a front elevation of a telephone provided with an apparatus according to the present invention.

Fig. 2 is a side elevation.

Fig. 3 is a front elevation of the auxiliary microphone control.

Fig. 4 shows the whole of the apparatus after a second check or coin has been inserted in the opening, designed for the suburban calls and before collecting the coins.

Figs. 4 4 show two positions corresponding to that of Figs. 3 and 4 of the operation efiected by the second coin or check to change the position of the upper contact blades which put the auxiliary m1- crophone in the circuit.

Fig. 5 shows the position of the lower contacts for placing the electro-magnet out of circuit.

Figs. 6 and 6 show the double opening for the introduction of the coin with the obturating means.

Figs. 7, 7 show the same opening the obturating means closing the right hand open Fig, 8 shows the locking motion when the telephone receiver has been taken down.

Fig. 9 is a similar view wlth the receiver on the hook.

which like parts are of the push button for use in case a wrong connection has been made. v

Figs. 16, 17 show two different positions of the polarized electromagnet mounted at the base of the apparatus which allows of altering the contact of the lower and the. upper blades when the current has been re-" versed and of collecting one or several checks or coins.

Fig. 18 shows a diagram of the circuit of the apparatus. In the mode of execution represented in Figs. 1 to 18, the apparatus comprises two openings 6 6 for Figs. 6 and 7 the introduction of the coins the right hand one of I which is always open when the apparatus is not in use, as will be seen in Fig. 6 in order to allow the introduction of a coin when it is desired to make a town call, the left hand one being closed and opening only (Fig. 7) after the first coin has been introduced in the right hand opening, the left hand opening being designed for the introduction of a second coin only when it is desired to make a, suburban call. When a coin or check 15 has been introduced in the opening 6 as it falls in the chute 6 it must engage the extension 7 of a rocking lever which in its normal position of rest occupies the position shown in Fig.9 when the receiver is well hung on the hook, the arm 7 of said lever being heavier than the arm 7. The horizontal position is also facilitated by the action of the hook 16 of plate 16 upon the heel 7 when the receiver is put back. In this position the upper movable plate 16 is locked by the hook 48 of an oscillating part .49 which is acted upon by a spring 50. The movable plate 16 is provided with a perforated part 47 secured upon it by means of a screw 46 and through which rfora- ,tion the telephone hook passes. W h en the receiver is hung up' the hook 48'being substantially opposite a projection 16 of the part' 16 prevents the latter from going u when the receiver is taken from the hoo f a coin has not been previously inserted in the opening 6". In this inoperative posi tion the projection 16 is brought under the hook 48 by the action of an abutment 7 of the lever 7 engaging the'bottom of the groove 49 of the part 49 as will ,be seen in Fig. 9 and locks the hook 48 inits suspended position. When the introduction of the'coin which operates the rocking of the lever 7 has been effected as shown in F1iq8, the abutment 7 rises again and unice the part 49 which owing to the action of the sprin compels the projection 16 to free the hoo .48; the receiver may then be taken off the hook and consequently the part 47 and the movable plate 16 may move hung on the hook the arm 53 is free and the spring 52 pushes the abutment 56 in the coin chute. On the contrary when the receiver is ,well hun up a pin 54 carried upon the part 47 wit which the. receiver arm 4 is engaged acts upon thearm 53 and the latter being pulled down compels the abutment 50 to oscillate in such a manner that it no longer projects in thechute.

Figs. 6, 6, 7,17 show a self operating closing device for the admission openings. It is constituted by an oscillating shutter 54; having its axis connected to a connecting rod 55 actuated b a rod 56 passing loosely through an extension 5'? secured to the part 47 and provided with two springs 58, 58 on either side of the extension 57. After the introduction of a coin or .a' check in the righthand opening 6" (Fig. '6) which is normally open when inoperative, and the receiver having been taken off the hook, the part 47 moves up, the lower spring 58 which was slightly compressed by the extension 57* is first distended, the latter then compressing'the upper spring 58 until it acts upon the'ring 59 of the rod 56, this ring in its upward movement actuating the connecting rod 55 which brings theshutter 54 in the position shown in Fig. 7" when the right hand opening designed for the'town call is closed and the left hand opening, in

which a second check must be inserted to make a suburban call is opened.

When the receiver is put back the extension 57 comes to bear upon the lower s ring 58 and when the compression'is su cient the rod 56 comes down and operates the shutter 54 which then returns to the position shown in Fig. 6

It will consequently-be understood that it is absolutely necessary to insert the check in the right hand opening which is the only one open in order to make a town call. the left-hand opening reserved to the second check for the suburban calls being open only when the receiver has been taken oil the hook, the right hand one being then closed.

The rocking device 13 carrying the two pins upon which the check 15 falls temporarily in the case .of a town call or .two.

passage of checks fall side by side in the case of a suburban call, may rotate upon an axis 14 carried by the bottom plate (Figs. 10,11, 12 This rocking device comprises also two controlling pins 30, 31, the first being actuated only for returning or giving back the coin when the connection-has not been made and the second pin 31 acting to prepare for collecting of the coin when'th'e connection asked for has been obtained.

Fig. 10 shows the rocking device in the normal position the two checks which have been introduced according to the case in view resting upon the two pins 12. When the desired connection has not been made the user puts backthe receiver, the part 16 falls down taking along a spring pivoted abutment 57 mounted on it. The abutment then acts upon the pin thus compelling the rocking device 13 to take the position shown in Fig. 11 and the check or the checks 15, 15 are returned out of the apparatus at 6. Owing to its spring the abutment 57 may clear the pin 30 when its operation is ended.

If the desired connection has been obtained the lower movable plate 59 rises under the. action of its spring 59*, being released, as will be explained later. This blate is provided with aninclined surface 60 located above a groove (30 which as it comes to act upon the pin 31 causes the rocking device 13 to oscillate and come in the position shown in Fig. 12 which corresponds to preparing for collecting the coin, the notch 60 retaining the rocking devicein this position up to the moment when the receiver is put back.

When the rocking device 13 is in this position every coin is retained between a stationary abutment 61 and a lever 62 pivot-' ed at (33 upon the back plate; the apparatus comprises a single abutment 61 and two levers (32, one for the town calls and the other for the additional coin which is required in order to obtain the suburban connection.

Finally the coins or checks fall in the .till when the receiver is put back on the hook at the end of the conversation, this taking place as will be seen further by the coming down of the moving part 16. \Vhen the rocking part 13 has reached in its movement the position indicated in Fig. 12, the

coin or coins 15 which have taken their position as above mentioned between the abutment 61 and the inner edge of one of several levers 62 are situated under an abutment 64 carried by a curved lever, '64 pivoted at 65 upon which acts a spring 66.

When the connection is ended the user puts back the receiver, the movable part 16 descends and its inclined surface 16 en-- gages a roller 67 carried by the lever 64, causing same tomove down, the coin or coins being pressed down by the abutment 64 in such a manner that they push back one of the levers 62 or both of them they being is transmitted by the microphone .to the operator at the exchangc'ofiice when a second coin'or check has been introduced in the lei hand opening with the object of establishing a suburban connection (Figs. 3 and 4). The secondary microphone may be put in or out of circuit by means of a pair of stationary contact blades 74, and of a middle movable blade 76, the latter when in its inoperative position being in contact with the left hand blade 74 and the secondary microphone being out of oil'- cuit.

When the user inserts a coin in the left hand opening (Fig. 4) it comes upon the projection 77 of a part rotating u )on an axle 79 and connected to a rod 80 \ercinafter described, the part 78 coming now in the position shown in Fig. 4 thus compelling its edge to push the middle blade 76 to the left that is to say againstthe blade 75 thus putting the secondary microphone in circuit and consequently allowing the switch board operator to hear the sound of the bell produced by the impact of the check against it.

The apparatus is provided at its lower part with a polarized electromagnet 58 which draws an armature 80 when a reversal of current takes place when called subscriber has taken down his receiver, as shown in Fig. 17 said armature being integral with a lever 81 which carries a shaft 82 provided with a hook .82 designed to maintain in a stationary position a shaft 83 integral with the movable plate 59 (Fig. 16). \Vhen the current is reversed in said electromagnet, the armature 80 isattracted, the hook 82 frees the rod 83 which is integral with the movable plate 59 this plate being now drawn upwards by its spring 59".

The apparatus is also provided at its base with two stationary contact blades 84, 85 and one movable middle blade 86 (Figs. 4 and 5) acted upon by a cam 87 actuated by means of a rod 88 drawn in its movement by the movable plate 59.

When the middle blade is in its ino erative position it engages the upper blac e 85 (Fig. 4) and when the current has been'reversed that is when the plate 59 has effected its upward movement the middle blade contacts with the blade 84 (Fig. 5) thus short circuiting the electromagnet during the conversation.

conversation by the upward movement of the movable plate 59 because the abutment 59 of the latter-cannot reach during its upward movement the collar 80 as indicated in Fig. 5; this will be easily understood as the rod 80 has not moved down for the reason that a second check has not been introduced in the apparatus; the rocking case of suburban connections the introduction of a second check or coin produces the downward movement of the shaft 80 and the oscillation of the blade 86 when they come in' the positions shown in Fig. 5. When the current has been reversed that is when the desired connection has been made in addition to the change in the lower contacts the followingoperation takes place; the abutment 59 of the late 59 which is drawn upward by its spring 59 operates under the collar 80 of the rod 80 which it ralses and altering the position of the upper con tact puts the secondary microphone in short circuit.

In the-case when the user cannot be connected with the suburban line, the reversal of the current has not taken place and consequently the plate 59 remains in its lower position but the rod 80 has been'depressed by the introduction of the second coin and the blade 86 is in the position indicated in Fig. 4.

It is therefore necessary to return the up-.

per contacts in the position for starting n order to put the secondary IHlCI'OPhOHQ-Hl circuit ior the next conversation.

ThlS

ment of the movable plate 16 its element 16 imparts an oscillating movement to the blade 86 causing the rod 80 to move upwards and the part 78 to return to its position in Fig. 4, instead of that in Fig. 4" which it occupied previously.

The movable plate 59 has also for its function as it moves upwardswhen the current has been reversed to draw along the rod 99 by means of its upper abutment by the inter- 'mediary of a spring 91. the head of said rod coming under the portion 16 of the movable plate 16.

When thereceiver is put back the abut? ment 16 drives the rod 90 of which the lower portion 90 coming to bear upon the end-of the oscillating hook lever 81;.(Fig. 16) 'ensures a good suspension of the receiver.

The ascending movement" of the movable previously and will consequently is effected .by putting back the re ceiver when owing to the downward, move-' remove spring being compressed rotatesthe bolt 94 in such a manner that its portion 94 comes to bear against an abutment 95 integral with v the plate 16; as soon as the receiver hook I is depressed, the plate 1.6 movesdownwards, the bolt rotating still further when the abutment 95 comes under-the portion 945 and the latter coming above the abutment prevents the rising of the plate 16 and consequently of the receiver hooln- In the position shown in Fig. 10 the second locking is not actuated because the plate 59 has not been displaced as the reversal of the current has not taken place in the electromagnet 58. In the arrangement shown in Fig. 12, the bolt 94 is shown in its position prior to the locking, the inner contacts of the telephone being in the required osition for making the connection, the 100 ng is eifected only when the-hook is slightly depressed in order for instance to make an attempt to call after a conversation without introducing another coin in the apparatus. During this movement the abutment is in a position slightly under the one it'occupied revent the receiver hook from rising su ciently high'to close the conversation circuit; a second call when the talking is ended being put backthro'ugh the depression of the movable plate 16, the depression of the plate 59' then producing only the upper unlocking. It will be noted that-the rising movements of bothmovable plates 16 and 59 are independent, that' of the plate 16 being produced by the inner return spring of the hook 4 and that of the plate 59 by the traction of the spring 59 when the reversal of the current has disengaged the hook 82 from shaft 83. At a certain moment on the contrary their downward movement is conjugated owing to a slot 96 in plate 59 engagin a dowel pin 97 provided on plate 16. 7 ceiver has been taken ofi the hook the plate 16 rises completely. On the reversalof current taking place, the hook 94. frees the rod 93 and the plate 59 drawn along by its spring 59 rises to the end of itsmovement until its slot 96 engages the dowel pin 97. 7 When the conversation has ended the receiver is put back, the plate 16 comes down bringing with it the plate 59 by the intermediary of the dowel pin 97 which engages the bottom of the slot 96. 1

The. plate 59 is When the re- To the apparatus which has just, been deof calling again the switchboardoperator at the exchange oflice before putting back the receiver when a wrong number has been given. This device which is shown in the Figs. 13, 14, 15 of the appended drawings comprises a push button 98 drawn outwards by a spring 99 and provided inside with a projecting sharp edge 100 engaging a small roller 101 integral with a contact blade 102 which allows of breaking rapidly and intermittently the contactwith a second stationary blade 103.

The intermittent depression of the usb knob 98 produces only intermittent ashto one side or the other, thus making the fact that the roller 101 cannot remain upon the sharp edge 100 but necessarily falls oil to one side or the other, thus making the contact as soon as it is interrupted and totally preventing a lengthy interruption'of the current. p

The diagram of the electric wiring shown in Fig. 18 illustrates the various connections: 104, 105 are the the line conductors, the

contact blades being in the inoperative. position.

The mode of operation in the case of a suburban connection is as follows:

The opening on the left hand of the apparatus being closed, the user inserts in the right hand opening 6 (Fig. 6) a check or coin which as it falls rotates the rocking device 7 thus preventing the operation of the bolt 48 which locked the plate 16 in its lower position, the coin falling temporarily upon the rocking device 13, he then takes the receiver from the hook allowing the plate 16 to move upwards and thus producing the call contact at the office, the closure of the openng 6 and the opening of the open- 1n n the event of town calls two different cases may be foreseen:

(a) The desired number is busy or the call remains unanswered. The coin restlng temporarily upon the rocking device the coin will be returned to its owner by simply putting back the receiver. In reality the movable part 16 moving downwards, the spring abutment 57 which it carries acts upon the pin 30 of the rocking device and causes the latter to come in the position slgogvn in Fig. 11 so that the check is ejected a (b) The connection is made. The caller having inserted a coin and taken the telehone oh the hook the subscriber who has een called has taken his receiver off the hook. At that instant, the current is re versed the polarized electromagnet 58 operates, the armature 80 is drawn, the hook 82 draws back (Fig. 17) thus disengaging the part 83 which is integral with the movable plate 59, which being no longer locked 'is moved upwards by its spring 59 and as it ascends the inclined surface 60 and its notch 00 engage the pin 31 of the rocking device 13 which rotates and comes in the osition shown in Fig. 12, preparatory to co lecting the coin which cannot be e ected at that moment. I

\Vhcn the conversation has been ended the receiver is put back on the hook, the part 16 moves down and its inclined surface 16 comes to act upon the roller 67 of the curvilinear part 64 causing the coin to come between the stationary projection 61 and the oscillating lever 62 which actuates the counting device to which it is connected.

The hanging back of the receiver also actuates the part 56 which closes the left hand opening and uncovers the other.

The mode of operation in the case of a suburban connection is as follows:

The user having inserted a coin in the right hand opening which is open, the operatlons are the same as indicated in the case of a town call. Thereceiver having been taken down the connection is made with the telephone exchange and a suburban connection is asked for. The telephonist then instructs the caller to insert a' second coin which he must necessarily put in the left hand opening which is the only one open.

The introduction of the second coin actuates the cam 78 which changing the upper contacts puts the secondari'iy micro bone 72 in the circuit. Another e ect pro uced being that the coin in its fall strikes upon the bell 73 which gives a sound that is re produced by the secondary microphone and may therefore be heard by the telephonist who is thus informed that a second coin has been introduced in the apparatus.

From that instant, two ifi'erent cases may arise:

1st. Either the desired number is not free or the subscriber does not answer.

It will then be sufficient to put back the receiver to have both coins ejected. On the other hand the putting back of the receiver causes the rod 80 tomove upwards under the action of the part 86, 86 thus compelling the upper contacts to return to their first position in such manner "that the secondary microphone is short-circulted.

2nd. The desired connection has been made. When the two coins having been successively introduced in the apparatus as previously indicated for thefirst case the telephonist has given the required connection, the current is reversed in the electromagnet with the following results:

1. The movable plate 59 as it is drawn upwards by its spring 59 rotates the rocking part 13 upon which the two coins rest temporarily and compels it to come in the position shown in Fig. 12 which is that of precashing.

2. This same plate 59 carries the rod 80 upwards and the latter by the intermediary ofthe cam 78 alters the relative position of the upper contacts and consequently puts the secondary microphone 7 2 in short circuit.

3. The upward movement of the plate 59 actuating the cam 87 has also altered the position of the lower contacts to put the polarized electromagnet 58 in short circuit. The conversation therefore takes place in the same manner as on an ordinary line. When the conversation has ended and the user puts back the receiver the coins are pushed simultaneously in the till and on their passage they both operate a counting evice. Y c

When the user is called he can answer by putting a coin in the right hand opening and as there is no reversal of the current the; coin is returned when he puts back the receiver and without the counting device having been operated. What I claim and desire to secure by Letters Patent of the United States is 1. An automatic telephone apparatus for single and .double tariff which comprises two openings for the introduction of the coins, two chutes, a rocking lever on which the coins fall, a rocking lever for the suspension arm of the receiver a balanced rocking device, two pins upon same to temporarily receive the coins, pins designed to operate the rocking device, an obturating shuttor for closing the first opening when the first coin has been introduced and for uncovering the second opening when the re- 1 ceiver is taken off the hook, a mechanism for closing the second opening and opening the first when the receiver has been put back;

an upper movable plate for carrying the locking lever, a pivoted abutment in the coin chutes to prevent the coins from falling down in order to prevent the operation of the unlocking mechanism when the suspension of the receiver has not been completely effected, a spring pawl carried by the upper movable plate designed to act upon one of the pins of the rocking device when the receiver is put back in order to allow of recovering the coin or coins, a polarized electromagnet looking a lower movable plate when in the inoperative position and actuated by a currentreversal when the desired connection has been obtained, a driving spring for said movable plate, an inclined surface and a groove on said plate to actuate the second pin of the rocking device which then comes in a pro-cashing position, means to push down the coin or coins temporarilyretained, a secondary microphone which isonly put in circuit by the insertion of a second coin, a bell upon which the coin falls, upper contacts for the secondary microphone, lower contacts for the polarized electromagnet, and means to retain the polarlzed electromagnet in suspended position.

2. An automatic telephone apparatus for single and double tariff comprising two openings for the introduction of the coins, two chutes, a rocking lever upon which the coins fall, a locking lever for the suspening the locking lever, a pivoted abutment for preventing the unlocking when the re-.

ceiver has not been well hung on the hook, a polarized electromagnet for engaging when at rest a lower movable plate, a driving spring for said movable plate a secondary microphone, contacts for the putting in circuit of the secondary microphone by the oscillation of a cam put in action'by the passage of a second coin, a: sprin shaft actuated by the passage of a secon coin, a spring shaft actuated by the downward movement of the upper movable plate to change the upper contacts in order to put the secondary microphone in short circuit when the connection has not been made a bell upon which the second coin falls, lower contacts for the polarized electromagnet, means to alter the position of the lower contacts, means to maintain the suspension of the polarized electromagnet.

3. An automatic telephone apparatus for single and double tarifi' comprising two openings for the introduction of the coin,

two chutes, a rocking lever upon which the plate when the receiver has not been completely hung, a polarized electromagnet locking in its inoperative position, a lower movable plate, an armature for said electromagnet put in action by the reversal of the current, a hook integral with the arma- .ture to prevent when in the inoperative position the ascending movement of a lower movable plate, an operating spring for said movable plate, a secondary microphone, contacts to put in circuit the secondary microphone, means for short-circuiting same, a bell upon which the second coin falls,

lower contacts for the polarized electrotwo openings for the introduction of the coins, t'wo chutes, a rocking lever upon which the coins fall, a locking lever for suspension hook of the receiver, a balancedrocking device, two pins on same to temporarily support the coins two other pins to'actuate the rockin device, means to 1'0.- tate said rocking devise, a shutter for closing the first opening when a first coin has been introduced and for uncovering the second opening when the receiver is taken off the hook, means to operate the shutter, a movable plate for rotating the locking lever, a polarized clectromagnet for locking a lower movable plate when in its inoperative,

position, an armature for said electromagnet put in action by the reversal of the current, a hook integral with the armature to prevent the rising of the lower movable plate when in its inoperative position, a driving spring for said movable plate, a secondary microphone, contacts for putting said secondary microphone in circuit, means for short-circuiting said secondary micro phone, a bell upon which the second coin falls, lower contacts for actuating the polarized electromagnet when the current has been reversed, a shaft operated by the downward movement of the lower movable late to retain the armature of the polarized electromagnet in its suspended position.

5. In an automatic telephone apparatus, a plurality of coin chutes, mechanism to control the introduction of coins into the chutes mechanism for locking the telephone hook and operated by it, a coin controlled mechanism for unlocking the hook, a pivoted coin receiver for the coins dropped into the chute, electromagnetic means to tilt the coin receiver to retain the coin or coins and operated by talking current, means to operate the coinreceiver to return the'coin or coins and actuated from the telephone hook when the electro-magnetic mechanism remains inoperative, a device to notify the central station that another coin has been deposited,

means to place said device out of operation when communication. has not been established, and means also to bring said apparatus to a position of rest when communication is established.

6. An automatic telephone apparatus as in claim- 5 in which the telephone hook lever is connected to an upper plate moving in a straight line that controls the means for ejecting the coin or coins when said electromagnetic means does not operate, said plate also controlling the means to place said signalling means out of operation, the coin introduction control means and the mechanism for locking the telephone hook.

7. Apparatus as claimed in claim 5, in

which the coin receiving tilting means comprises a lower plate having rectilinear movement, a spring for actuating it, said plate being held against movement by said electromagnetic mechanism and released by reversal of current therein when communication has been established, said plate controlling during its movement in one direction the coin receiver to retain the coin or coins, a plurality of contacts, operated by said plate in an opposite direction to place said electro-magnetic mechanism out of operation and other contacts actuated by this plate to disconnect the device indicating the additional payment from the circuit.

8. Apparatus as claimed in claim 5, in which the means to control the introduction of the coins comprises a pivoted shutter normally maintaining one of the chutes 0 en, a rod connected thereto to swing the utter from one chute to the next, a lever to which the rod is connected, a pivoted perforate plate through which the telephone hook lever passes, and means to yieldingly connect the rod and plate to operate the shutter in unison with the hook lever.

9. A slot closing mechanism for apparatus as claimed in claim 5, comprising a spring actuated lug pivoted to pass into one of the coin chutes, a perforated lever through which the telephone hook passes, and a pin on said plate to operate the lug.

10. Apparatus as claimed in claim 5, in which the device to notify the central station includes a bell, a microphone and a plurality of contacts, and means to operate said contacts actuated by the insertion of a w microphone out of circuit in case communication has not been established.

12. Apparatusas claimed in claim 5, in which the signalling device is provided with contacts for placing it in and out of circuit, pivoted means for shifting the contacts and actuated by a coin, a rod connected to said pivoted means, an upwardly movable lower plate, a lug thereon to move said rod tonormal position-to restore the pivoted means and therebythe contacts to normal position 5 and disconnect the signalling device after telephonic communication has been established. I

In testimony that I claim the foregoing as my invention, I have signed my name.

CHARLES AMEDEE CAMBAY. 

